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java.lang.NullPointerException: 	at azkaban.jobtype.HadoopJobUtils.proxyUserKillAllSpawnedHadoopJobs(HadoopJobUtils.java:346)	at azkaban.jobtype.HadoopHiveJob.cancel(HadoopHiveJob.java:290)	at azkaban.execapp.JobRunner.kill(JobRunner.java:658)	at azkaban.execapp.FlowRunner.kill(FlowRunner.java:930)	at azkaban.execapp.FlowRunner.kill(FlowRunner.java:907)	at azkaban.execapp.FlowRunnerManager.cancelFlow(FlowRunnerManager.java:601)	at azkaban.execapp.ExecutorServlet.handleAjaxCancel(ExecutorServlet.java:322)	at azkaban.execapp.ExecutorServlet.doGet(ExecutorServlet.java:116)	at javax.servlet.http.HttpServlet.service(HttpServlet.java:707)	at javax.servlet.http.HttpServlet.service(HttpServlet.java:820)	at org.mortbay.jetty.servlet.ServletHolder.handle(ServletHolder.java:511)	at org.mortbay.jetty.servlet.ServletHandler.handle(ServletHandler.java:401)	at org.mortbay.jetty.servlet.SessionHandler.handle(SessionHandler.java:182)	at org.mortbay.jetty.handler.ContextHandler.handle(ContextHandler.java:766)	at org.mortbay.jetty.handler.HandlerWrapper.handle(HandlerWrapper.java:152)	at org.mortbay.jetty.Server.handle(Server.java:326)	at org.mortbay.jetty.HttpConnection.handleRequest(HttpConnection.java:542)	at org.mortbay.jetty.HttpConnection$RequestHandler.headerComplete(HttpConnection.java:928)	at org.mortbay.jetty.HttpParser.parseNext(HttpParser.java:549)	at org.mortbay.jetty.HttpParser.parseAvailable(HttpParser.java:212)	at org.mortbay.jetty.HttpConnection.handle(HttpConnection.java:404)	at org.mortbay.jetty.bio.SocketConnector$Connection.run(SocketConnector.java:228)	at org.mortbay.thread.QueuedThreadPool$PoolThread.run(QueuedThreadPool.java:582)